JP 2018-205527 A Example 1 — Sigma / Ochiai & Sato
| 16 elements / 13 groups |
| f = 16.446 mm design; 16 mm marketed |
| F/1.46 design; F1.4 marketed |
| 2ω = 84.21° at Y = 14.20 mm |
| 3 FLD / 2 SLD / 2 molded aspherical elements |
Single-element inner focus: G3 / L31 moves toward the object. The close endpoint extrapolates the patent kinematics to Sigma's published 0.25 m / 1:9.9 specification; the patent's own tabulated near state is beta = -1/40.
| Element | Type | Glass |
|---|---|---|
| L11 | Positive Meniscus | BSC7 / N-BK7-class borosilicate crown (517/642) |
| L12 | Negative Meniscus | TAFD55-class high-index glass (001/291) |
| L13 | Neg. Meniscus (1× Asph) | M-BACD5N-class molded barium crown (589/613) |
| L14 | Biconcave Negative | FCD100-class FLD fluorite-equivalent glass (437/951) |
| L15 | Biconvex Positive | TAFD55-class high-index glass (001/291) |
| L16 | Biconvex Positive | TAFD35-class high-index lanthanum glass (911/353) |
| L17 | Biconvex Positive | FCD100-class FLD fluorite-equivalent glass (437/951) |
| L18 | Biconcave Negative | E-CF6 (HOYA) |
| L19 | Negative Meniscus | E-FD5 (HOYA) |
| L21 | Biconvex Positive | FCD505 (HOYA, SLD low-dispersion crown) |
| L22 | Negative Meniscus | S-LAM7 (OHARA) |
| L23 | Biconvex Positive (1× Asph) | M-LAC130-class molded lanthanum crown (694/532) |
| L31 | Positive Meniscus | FCD505 (HOYA, SLD low-dispersion crown) |
| L41 | Negative Meniscus | SF6 / S-TIH6-class dense flint (805/255) |
| L42 | Biconvex Positive | FCD100-class FLD fluorite-equivalent glass (437/951) |
| L43 | Negative Meniscus | S-LAH95 (OHARA) |
Detailed analysis available in the interactive viewer above.